Implement runtime color scheme calculation

[vitonsky]

Color picking like this https://twitter.com/nolimits4web/status/1557792458603470848 is boring.

Let's implement tool, to calculate CSS variables in runtime.

We describe design tokens as right now, compile CSS variables at build time as right now, but also, we'll introduce a library to compile CSS variables in runtime.

Then, user may pick accent color and all colors will recalculate.

The most important thing is support a transformers described in design tokens